1. In a television tube, the electron beam travels from west to east. In order t

Question

1. In a television tube, the electron beam travels from west to east. In order to deflect it south, how does the magnetic field need to be oriented?

a North
b South
c East
d West
e Out of your computer screen.
f Into your computer screen.

2. If the electron has an initial velocity of 4800 m/s east, and the magnetic field has a magnitude of 0.002 T, what is the magnitude of the acceleration of the electron?

3. What is the speed of the electron 0.1 milliseconds after it entered the field?

Image of Exercise: http://i41.tinypic.com/o0pkxu.jpg

Thanks!

Explanation / Answer

1) from the right hand thumb rule the magnetic field should be directed into your computer screen 2) the acceleration is given by a = v^2/r where r= m*v/(B*q) => a = 1.602*10^-19*4800*0.002/(9.1*10^-31) = 1.69*10^12 m/s^2 3) the speed of the electron will remain the same as the force acts normally laways.

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